Step 1: Materials List
12" round balloons
The pattern is available at the USA Volleyball site above. It'll tell you how much to enlarge the pattern pieces. (I'm showing only one end piece, since they're the same size--the only difference is that you'll put a buttonhole in one.) The ruler shots indicate the dimensions I used, in case you trust yourself to make your own pattern. Mine accommodates a 12" balloon very nicely.
By the way, do read the information on the USA Volleyball site. They won't tell you this, but it's kind of like a teddy bear for people who probably don't need to be seen in public with teddy bears--the texture is comforting, it's a little cuddly, and if you keep the balloon good and firm, you can bounce it off somebody's head without doing too much damage.
Step 2: Cut It Out
Step 3: Sew the Side Pieces
The second picture here shows what it'll look like when you've sewn all but the last seam.
The third picture shows how far on both ends to sew those first and last panels together--about 3". There will be a space down the middle of those two panels to make it possible to sew in the end pieces.
Stitch the seams flat around the end openings. This will make it a lot easier to stitch through the end pieces and avoid bunching of fabric.
Step 4: Prepare the End Pieces
You'll notch the other end piece, but first you'll make a buttonhole in it. This is where they balloon will go, so make the buttonhole about 1" long. Then repeat the notching and topstitching for the second end piece.
Step 5: Sew in the End Pieces
So you're stitching directly over the top stitching you did earlier. Try to match the points of the end piece to the seams on the ball, but don't worry too much if you miss here and there.
The second photo here shows the first end piece completely sewn in.
Third photo shows the buttonhole piece going on.
Step 6: Finish the Edge
Then turn it right side out (seams in), fold under the 5/8" seam allowance (photo 2) and stitch the two folds as close to the edge as possible. You could do this by hand, if you want, or just run it on the machine, as in photo 3.
Step 7: Insert the Balloon, Blow It Up, and Have a Ball
Step 8: Well, Some People Like It
These are pretty sweet party favors, and you can make one in about an hour, barring interruptions, if you can just part with those jeans.